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Volume 12, Issue 2, Pages 85-89

Further Nuclear Magnetic Resonance Studies of Flavone

Cirilo García-Martínez, Martha S. Morales-Rios, and Pedro Joseph-Nathan

Departamento de Quimíca del Centro de Investigación y de Estudios Avanzados, Instituto Politécnico Nacional, Apartado Postal 14-740, México, D. F., 07000, Mexico

Copyright © 1994 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The incorporation of 92.7% of 13C at the carbonyl group of flavone allowed to measure two- and three-bond carbon-carbon coupling constants which range from 1.4 to 3.5 Hz, and to measure two-, three- and four-bond carbon-hydrogen coupling constants which range from 0.3 to 3.8 Hz. A mixture of unlabelled flavone 1 with its 4-13C labelled analogue 2 further allowed to measure one-bond induced isotope shifts of -15.5 and -16.2 ppb for C-3 and C-4a, respectively, and a three bond induced isotope shift of +3.7 ppb for C-I'.